>> P.64
Inspection of bearingMaintenance and inspectionCleaning of bearingMaintenance and inspectionWhen inspecting a bearing after removal, the appear-Maintenance and inspection are carried out to main-ance of the bearing should be recorded rst. Then, tain good performance of bearings installed in the after the residual amount of lubricant is checked and machine.a sample of lubricant is collected, the bearing should Maintenance is performed by checking the machine be cleaned.operating conditions, checking and replenishing or For cleaning, light oil or kerosene is commonly used. replacing the lubricant, checking the bearing and Cleaning is divided into rough cleaning and final related parts by periodic disassembly and other such cleaning, and wire gauze is set as a raised bottom in a procedures.container to prevent the bearing from touching the bot-Items for inspection of a running bearing in a machine tom of the container.include the bearing temperature, noise, vibration and Lubricating grease and adhering substances such as condition of lubricant.foreign particles are removed with a brush, etc., When any abnormality is found during operation, the using oil for rough cleaning. Care should be taken cause should be investigated and measures taken by during this process, because if the bearing is turned referring to the section on running test on page A59. with foreign particles attached, the raceway surfaces When removing a bearing, refer to the section on dis-may be scratched.mounting on page A59.Final cleaning is carried out by turning the bearing in cleaning oil. It is desirable that the cleaning oil is kept Damage, causes and corrective actionclean by filtering. Immediately after cleaning, the bearing must be protected against corrosion.Rolling bearings can generally be used fully up to their Inspection and evaluation of bearingrolling fatigue life if they are properly selected, mount-ed, operated and maintained. However, they may actually be damaged earlier than their expected life-The judgement as to whether the removed bearing is times creating problems or accidents. Common reusable depends on the inspection after cleaning. causes of damage include improper mounting or han-Conditions of the raceway surfaces, rolling elements dling, insufficient lubrication and penetration of foreign and fitting surfaces, wear condition of the cage, particles.increase of bearing clearance, dimensions, rotational It may be difficult to determine the exact cause of a accuracy, etc. should be checked for damage and problem by checking only the damaged bearing. The abnormalities.conditions of the machine before and after the occur-The evaluation is performed based on the experience rence of the damage, the location and the operating taking into consideration the degree of damage, and ambient conditions of the bearing, the structure machine performance, importance of the machine, around the bearing, etc. should also be examined. It operating conditions, period until the next inspection, then becomes possible to assess the cause of the and other such factors.damage by linking the conditions of the damaged bearing to the probable causes arising from the machine operation, and to prevent the recurrence of similar problems.Common types of damage, causes and corrective action are listed in Table 41.A61
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